Mechanical movement



3 Sheets-Sheet 1.

(No Model.) I Dr. L. TOWER.

MECHANICAL MOVEMENT.

No, 542,179. Patented July 2, 1895.

C imea wow (No Model.) 3 Sheets-Sheet 2. D. L. TOWER.

' MECHANICAL MOVEMENT. No. 542,179. 2' Patented July 2, 1895.

(No Model.) 3 Sheets-Sheet D. L. TOWER.

MECHANICAL MOVEMENT.

.No.542,179. PatentedJu 1y2,1895;

fig. 5. F B jf UNIT STATES PATENT OFFICE.

DANIEL L. TOWER, OF BROOKLYN, NEW YORK.

lVlECHANlCAL MOVEMENT.

$PECIFICATION forming part of Letters Patent No. 542,179, dated July 2, 1895. Applica i n find SeptemberZl, 1892. semi No. 446,386. (No model.)

drawings, and to the letters of reference marked thereon, making a part of this specification.

The object of my invention is to produce an improved mechanism by which the movement of a lever or key may be imparted to a rotatory or oscillatory body, such as a shaft, and the movement of the said body be checked positively and with accuracy at a predetermined point. i

The device will be found useful in a great variety of'machines, and particularly in that class of registers or indicators in which a rotating or oscillating dial or wheel or pointer is employed and in that class of type-writing machines in which the types are formed or borne on a wheel and must be broughtone at a time to the line of print.

In the drawings, wherein I have illustrated one embodiment of my invention,Figure 1 is a longitudinal section on the line m w of Fig. 3 of an apparatus constructed in accordance with my invention. Fig. 2 is a partial plan view of the same. Fig. 3 is a section on the line y y of Fig. 1. Fig. 4 is a section on the line 2 z of Fig. 1. Fig. 5 is a detail view, in sectional elevation, illustrating a different form of apparatus embodying my invention. Fig. 6 is a detail plan view showing another form; and Fig. 7 is a detail view, in sectional elevation, showing still another form.

In the drawings the rotatory or oscillatory body to which movement is to be imparted able bearings f f a shaft F, to which are secured'the arms 9 g of the bail G, having an inclined upper edge, as shown clearly in Fig. 3. The shaft F also has fixed theretoan arm H, which is connected in any convenient manner to the shaft A to impart its movement thereto. As a suitable intermediate connection for this purpose, I have shown the arm H as connected by a rod h to a sliding rack h, with which meshes a pinion a on the shaft A.

Beneath the leversE is journaled a second shaft J, to which are secured the arms it: It of a bail K, also having an inclined upper edge,

the direction of inclination being opposite to that of the bail G. Connections between the shaft J and the shaft A might be made similar to the connections between the shaft F and the shaft A; but as the object is to have above, in which'the shafts F and J are independently connected to the shaft A. The shaft F has a short arm H, which is connected by a link H with a rack H which engages the pinion 0/. upon one side of the same, while the shaft J has a short arm J, which is connected by a link h with a rack 71 engaging the pinion 0. upon the other side. The two bails G and K are thus compelled to move together and to the same extent, but in opposite directions.

In the construction shown in the drawings each lever E is drawn'upward by a spring 71, which is attached to a cross-rod N, suitably supported above the levers. A stop-rod n is supported by brackets n to limit the upward movement of the levers E under the stress of the springs 'n n.

The operation of my improved mechanism will now be readily understood. Assuming that all parts are in their normal position, let it be supposed that the lever E at the extreme left of Fig. 3 is depressed. In its downward movement the arm 6 engages the bail G at the highest point of its inclined edge, and therefore moves the bail through its greatest lever is depressed and thelower end of its inclined edge will meet the lever E just as the shaft A reaches the limit of its predetermined movement, and will therefore lock the lever E positively against any farther movement downward. The lever E, being now released by the operator, will return to its normal position under the influence of the spring at without aflfecting the shaft A. If new any other lever E is depressed, that at the extreme right of Fig. 3 being taken as an example, the under side of said lever will first strike the higher end of the inclined edge of the bail K and will depress the same thereby through the described connections, rotating the shaft A in the direction of the arrow W .on the wheel B to the limit of its motion in that direction. The bail G will be lifted as the bail K is depressed and the lower end of the inelined edge of the said bail G will meet the finger e just as the limit of motion of the shaft A is reached and will lock the lever against any farther movement downward.

The operation of any of the intermediate levers E will now move the shaft in the direction of the arrow n in a manner already explained, the movement of the shaft being checked positively by the action of the two opposing bails on the'operated lever at the exact point determined by the relative position of the operated lever.

I have shown in the drawings, and described above, a desirable form and arrangement of mechanism embodying my invention;

but I do not intend to limit myselfto the particular construction shown. Thus, instead of struck by them at different distances from their pivots, it being necessary, simply, that the levers shall act differentially upon the bail. Likewise the form of the connections between the bails and the shaft A may be varied widely. Thus the shafts F and J might be dispensed with and the arm II be carried directly by one arm of either bail. Again, in place of the sliding rack h and the rod 71, each shaft F J or bail G K might be provided withan arm H or J and cords j 3' passed therefrom to and around the shaft A in opposite directions, as shown in Fig. 7. These and many other variations of the connections are equivalent of the connections shown, so far as concerns the scope of my invention, and need not be described in detail.

I claim as my invention 1. The combination of a rotatable body, a series of keys or levers, two bails oppositely disposed with respect to said levers, and connections from said bails to said rotatable body whereby thelatteris moved in opposite directions by the movement of the bails and whereby each bail is moved in opposition to the other, substantially as shown and described.

2. The combination of a rotatable body, a series of levers, two bails disposed oppositely with respect to saidlevers, and each operated diiferentially by said levers, connection between said bails whereby they move together but in opposite directions, and a connection from said bails to said rotatable body, substantially as shown and described.

3. The combination of a rotatable body, a series of keys or levers, two bails oppositely disposed with respect to said levers and having inclined edges whereby they are operated differentially by said levers, connection be tween said bails whereby they may move together but in opposite. directions and a coin nection from said bails to said rotatable body whereby the latter may be rotated in either direction, substantially as shown and described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

DANIEL L. TOWER.

Witnesses:

A. N. J ESBERA, A. WIDDER. 

